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Casca found the whole refusal of the crown performance quite amusing. The crown is offered three times to Caesar and he refuses it to get the crowd more excited about his ascension. His little skit backfires though, "did clap him and hiss him, according as he pleas'd and displeas'd them, as they use to do the players in the theatre." I think Casca finds the plebeians easily manipulated if one knows how. He sees the Plebeians as too simple minded for Caesar’s theatrics.